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DAC0808 – 8 Bit D/A Converter

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DAC0808 is a D/A converter IC and is used for converting 8 bit digital data input to analog signal output. It is a monolithic IC featuring a full scale output current settling time of 150 ns while dissipating only 33 mW with ±5V supplies. The chip accuracy of conversion is good and power consumption is also low to make it popular. The power supply currents of the DAC0808 are independent of bit codes, and exhibits essentially constant device characteristics over the entire supply voltage range.

 

Pin configuration

DAC0808 is a sixteen pin device and description for each pin is given below.

Pin

Name

Description

1

NC

No connection

2

GND

Ground

3

VEE

Negative power supply

4

IO

Output signal pin

5

A1

Digital input bit 1 (Most Significant Bit)

6

A2

Digital input bit 2

7

A3

Digital input bit 3

8

A4

Digital input bit 4

9

A5

Digital input bit 5

10

A6

Digital input bit 6

11

A7

Digital input bit 7

12

A8

Digital input bit 8 (Least Significant Bit)

13

VCC

Positive power supply

14

VREF+

Positive reference voltage

15

VREF-

Negative reference voltage

16

COMPENSATION

Compensation capacitor pin

 

Features and Electrical characteristics of DAC0808

  • 8 bit parallel digital data input
  • Fast settling time (typical value): 150 ns
  • Relative accuracy at ±0.19% maximum error
  • Full scale current match: ±1 LSB
  • Non-inverting digital inputs are TTL and CMOS compatible
  • High speed multiplying input slew rate: 8 mA/μs
  • Power supply voltage range: ±4.5V to ±18V
  • Low power consumption: 33 mW@ ±5V
  • Maximum Power dissipation: 1000 mW
  • Operating temperature range: 0ºC to +75ºC

 

Similar D/A Converters

DAC0807, DAC0806, DAC0800, DAC0802, AD557

 

Overview of DAC0808

DAC0808 IC is used in applications where a digital to analog conversion is required. The chip used to be popular a decade ago and its applications used to be many but at present there are many modern IC which can perform DAC with higher resolution, speed and efficiency. So this device is mainly used for reference and beginner applications and nothing more. For advance applications microcontroller with DAC feature or DAC IC with serial interface is preferred at present.

 

How to use DAC0808 IC

A typical application circuit for DAC0808 is already given in the datasheet and we can use that circuit to develop applications without worry as the circuit is tested working.

DAC0808 Circuit Diagram

In circuit

  • For working of device DAC0808 we need two voltage sources +5V and -15V as shown in diagram. This is a major drawback which is eliminated in modern DAC to make them work from a single power source.
  • Eight digital inputs are given to the chip and are supposed to be in order from MSB to LSB. This is also major drawback because we need to waste 8 I/O pins this is also eliminated in modern DAC’s.
  • A +10V power source is connected as reference voltage for the device and the negative reference is grounded.

 

Working

The device takes in parallel 8 bit data from a microcontroller or microprocessor and converts that data in to analog signal at the output. And the analog output from DAC is a current quantity and this needed to be converted in to voltage parameter for using in application easily. So to convert the current parameter in to voltage parameter we will use op-amp circuit as shown in circuit diagram. This op-amp circuit is called current-to-voltage converter.

The output analog voltage from op-amp is in linear relation with input digital value and hence DAC conversion with DAC0808 is achieved. Similarly you can also use other application circuits for DAC0808 given in the datasheet.

 

Applications

  • Analog and digital circuits
  • Electrical measurements
  • Audio conversion
  • Hobbyist applications

 

2D-Model

All dimensions are in inches [millimeter measurements in brackets]

DAC0808 IC Dimensions



Download Datasheet PDF: